On Mar 10, 2015, at 7:34 AM, Marc Feeley feeley@iro.umontreal.ca wrote:
On Mar 10, 2015, at 5:53 AM, Álvaro Castro-Castilla alvaro.castro.castilla@gmail.com wrote:
Awesome project! Raspberry Pi is truly a wonderful machine. Thank you for posting your results. Since I don't have a reference performance, is this 20x difference expected or more than expected? Based on other tests with very different environments on mobile ARM, I would say that it should be on the 10x-50x ballpark.
The difference in bogomips is about 20x, so I think the 20x difference in execution time is expected.
Marc
On my 5th generation iPod Touch, which also uses an Arm CPU, (expt 3 1000000) takes 429ms and then squaring that takes 440ms.
Which is almost exactly the same as on the Pi times when using gcc-4.8 with the good hardware specifications but keeping -fno-strict-aliasing.
Brad